Massive overfueling from my GSXR 750 Mikunies, i am about to reset the fuel pressure regulator again to about 1.5 psi.
If this does'nt help what other option do i have.
I know nothing about these carbs as they came with the engine, so can i reduce the fueling by moving the needles up or down?
Is there a mixture screw that i can tweek?
If only a bike fuel pump will do which one can i retro fit in place of the Facet one i have ( can't have a pump in tank easily)?
Would a fuel return be any use?

This happened to me recently and tghe answer, which has worked so far, was to fit the lowest pressure Facet pump, something like 2.5 to 3.5 if I remember correctly.

John

I'd say the same - I couldn't get a Facet pump with a regulator to work properly, but a bike pump without a regulator worked 'out of the box' so to speak.

It's the ability to deliver a high volume of fuel at a low pressure that makes all the difference.

I wouldn't bother with a low pressure facet one. Although it might work it equally might not. Just use a boggo standard bike fuel pump as already suggested. Cheap as chips off the bay.....

quote:

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Originally posted by BenB
I wouldn't bother with a low pressure facet one. Although it might work it equally might not. Just use a boggo standard bike fuel pump as already suggested. Cheap as chips off the bay.....

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Webcon do a pump for there webers that run at about 2psi so no need for regulator.

Its like the old su pumps.

Hi Snapper!
If you wish to try smaller main jets I have a selection left over from various dynojet kits. All new and unused.
They are probably too small but can easily be drilled out to a more suitable size.
What size are your main jets at the moment?
I have FOUR 116 jets, Four 120, FOUR 125, TWO 126, TWO 130 and TWO 134.
These are not the needle jet, they are the MAINS that are found in the float chamber.
Sets of small drills are available on fleabay.
Once you have found a better size ( if indeed the main jet is your problem) you can buy a new set of that size. Jet drilling is often frowned upon but can save you buying loads of jets to experiment with.
I also have found a set of needles of unknown pedigree. They are 56mm long and have a 6mm collar at the top. They are marked N1V V. Probably OEM needles. Also a set of springs, 78mm long by 15mm diameter. Any use??
Jets, £3.50 a set of four, ( plenty on fleabay at £2.50 EACH!!) needles and springs you can have for free. All the lot £14, plus post of course.
Also, have you always had this overfueling problem? What angle are your carbs mounted at? Same as when they were on the bike? Could this be the problem? Is the choke mechanism stuck on? Is the air filter restrictive? Are all four cylinders overfueling or just one? Check the plug colour on all four.
I suspect that the main jet size probably isn't the culprit but my offer stands. If you don't want them I'll put them in the FOR SALE section. They must be of use to some Locoster.
Good luck sorting out your problem anyway. Answer all questions that are asked and someone will usually come up with a solution.
Geoff.

As already suggested a bike pump sounds as if it will cure your problem, If you have a means of temporalily rigging a gravity feed fuel supply ( I use a tank off an old cement mixer) this should get it running,

tony

Spyder, your offer is very welcome, however i need to keep the car on the road so will find some quick solutions before trying a rolling road.

I though bike carbs could work at almost any angle, that said the static angle of my carbs is set by the manifold which is straight not angled up as most are.